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Swipe in from the right side of the screen on your Windows 8 device. Tap on “Settings” and select “Change PC Settings. Click on “Accounts” and select “Sign-in options. Click on “Change your password,” and follow the prompts provided by Windows 8 to change or reset your password.
If you cannot sign in to your Windows 8 device because you have forgotten your Microsoft Live password, you can reset your password at https://account.live.com/password/reset. However, if you still encounter problems with signing in after resetting your password, you will be required to reinstall Windows 8. ” If you are using a mouse instead of a touchscreen, point to the lower-right corner of your screen, then move the mouse upwards to access “Settings.” ”